參數(shù)資料
型號(hào)： STR73XF
廠商： 意法半導(dǎo)體
英文描述： ARM7TDMI 32-bit MCU with Flash, 3x CAN, 4 UARTs, 20 timers, ADC, 12 comm. interfaces
中文描述： ARM7TDMI的32位微控制器的閃存，3倍的CAN，4個(gè)UART，20定時(shí)器，ADC和12通信設(shè)備。接口
文件頁數(shù)： 44/53頁
文件大?。?/td> 764K
代理商： STR73XF
Electrical parameters
STR73xF
44/53
3.3.6
10-bit ADC characteristics
Subject to general operating conditions for V
DDA
, f
MCLK
, and T
A
unless otherwise specified.
Table 24.
Notes:
1.
Unless otherwise specified, typical data are based on T
A
=25°C and V
DDA
-V
SS
=5.0V. They are given only
as design guidelines and are not tested.
2.
Calibration is recommended once after each power-up.
3.
During the sample time the input capacitance C
(6.8 max) can be charged/discharged by the external
source. The internal resistance of the analog source must allow the capacitance to reach its final voltage
level within t
After the end of the sample time t
, changes of the analog input voltage have no effect on
the conversion result. Values for the sample clock t
S
depend on programming.
Table 25.
1.
ADC Accuracy vs. Negative Injection Current: Injecting negative current on any of the standard (non-
robust) analog input pins should be avoided as this significantly reduces the accuracy of the conversion
being performed on another analog input. It is recommended to add a Schottky diode (pin to ground) to
standard analog pins which may potentially inject negative current. The effect of negative injection current
ADC characteristics
Symbol
Parameter
Conditions
Min
Typ
1)
Max
Unit
f
ADC
0.4
10
MHz
V
AIN
Conversion voltage range
2)
V
SSA
V
DDA
V
I
lkg
Negative input leakage current on
analog pins
V
IN
<
V
SS,
| I
IN
|<
400μA on adjacent
analog pin
5
6
μ
A
C
ADC
Internal sample and hold
capacitor
3.5
pF
t
CAL2)
Calibration Time
f
ADC
= 10MHz
580.2
μs
5802
1/f
ADC
t
S3)
Sampling time
f
ADC
= 10MHz
1
14
μs
t
CONV
Total Conversion time (including
sampling time)
f
ADC
= 10MHz
3
μs
30 (10 for sampling
+20 for successive
approximation)
1/f
ADC
I
ADC
Running mode
Normal Mode
5
mA
Power-down mode
1
μ
A
ADC Accuracy with f
MCLK
= 20MHz, f
ADC
=10MHz, R
AIN
< 10k
RAIN,
V
DDA
=5V. This assumes that the ADC is calibrated
2)
Parameter
Conditions
Symbol
Typ
Max
Unit
|E
T
|
Total unadjusted error
1)
1.0
2.0
LSB
|E
O
|
Offset error
1)
0.15
1.0
|E
G
|
Gain Error
1)
0.97
1.1
|E
D
|
Differential linearity error
1)
0.7
1.0
|E
L
|
Integral linearity error
1)
0.76
1.5
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